- the doctrine that all knowledge is limited to experiences by the self, and that transcendent knowledge is impossible.
- Ethics.
- any of various theories maintaining that moral judgments are statements concerning the emotional or mental reactions of the individual or the community.
- any of several theories holding that certain states of thought or feeling are the highest good.
- the meta-ethical doctrine that there are no absolute moral values but that these are variable in the same way as taste is
- any similar philosophical theory, for example, about truth or perception
- any theological theory that attaches primary importance to religious experience
- the quality or condition of being subjective
